Chaeles a



(No Model.)

0. A. HUSSEY.

INGANDESGENT ELECTRIC LAMP. No. 310,516. Patented Jan. 6, 1885.

' Wibzesaes v WMW L CHARLES A. HUSSEY, OF NEW YURI i, N. 31, ASSIGNOR TO ELECTRIC LIGHT AND POYVER COlliPr\..lfliT,

ENGANDESGENT ELECTi-"l Farmer THE HUSSEY Shirl t PLACE.

SPECIFICATION for .iing part of Letters Fateni: No. 310,516, dated January Application filed .-\1ll'1l10, (Xe modeli) To all whom it may concern/.-

Be it known that I, CHARLES A. of New York, in the county and State or New York, have invented a certain new and useful Improvement in Incandescent Electric Lamps, of which the following is specification.

My improvement relates to electric lamps of the kind which are commonly known as incandescent lamps.

The object of the improvement is to provide a more desirable means than any new in existence whereby such a lamp may be lighted and the light varied and extinguished. Provision has heretofore been made for attaining this result by arranging outside the lamp a coil or coils of wire or sticks or filaments of carbon. These wires and sticks or filaments of carbon have necessarilybeen made of large diameter-or, in other words, of low resistance-to prevent them frombeing excessively heated when switchedinto the lamp-circuits, and hence they have been obj ectionabl y bulky. To avoid the objections named I arrange inside the lamp a filament of carbon additional to that ordinarily employed to produce light, and provide means whereby more or less of this extra filament of carbon may be switched into the circuit. I am enabled to make this extra filament of carbon of high resistance, as it may be highlyheated without doing injury, and,being in avaciu1n1,will not be rapidly deteriorated from this cause.

My improvement also involves other fcatures, which will be described in detail, and then pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional side view of a lamp embodying my improvement, and Fig. 2 is a diagram illustrating the same.

Similar letters of reference designate corresponding parts in both figures.

A designates the flask or globe of thelam p. It is made of glass, as usual.

at designates a solid piece or stem of glass, which is formed around the metallic conductors of the lamp, and is then fused to the flask or globe. The manner of securing the carbon filaments to these conductors may be ordinary.

The main carbon filament may be made of any approved material but it is of a peculiar shape. It consists of two parallel portions, 0, extending from the conductors, two reverted portions, 0, extending from the para lel portions 0, and an approximately areshaped portion, c extending between the reverted portions 0. This shape I consider a very desirable one for disseminating the light, as it gives alight which approximates in shape to that given by a fislrtail gas-burner.

The solid stem a of the ilask,wlien extended beyond the ilask A, as shown, forms a convenient means for connecting the flask with its support. As shown, it fits in a block of india-rubber or other suitable material, B, which may be fitted into the socket of a holder for the lamp. This block 13 may have on its exterior metallic strips (1, adapted to make contact with terminals arranged in the socket of the holder, to which wires are connected whereby the electric current is supplied to the lamp.

(J is a commutator or regulator, whereby more or less resistance may be switched into circuit with the main carbon filament c c 0 This regulator consists of a stationary cylindrical piece, 0, of insulating material, which is mounted on or may form part ofthebloek B, and has at intervals upon its periphery strips ff, the, of metal. A metal spring, 5 supported on a rotary spindle, h, may, by turning the spindle, be brought into contact with either of the metal strips ff, &c. A wire, 2 extends from one of the metallic strips cl to the spindle 71, carrying the spring 5 and a wire, j, extends from the other metallic strip d to a conduct-or. From the strip f awire, it, extends to a loop or extension from an 'extra carbon or filament, D, which is arranged in the flask A below the main carbon filament c c c", and is bent around into the form of a circle, without, however, having its ends in contact. From. a second loop or extension arranged on the carbon filament D at a short distance from the first a wire, 70, extends to the? metal strip f of the regulator. From the strip fot the regulator a wire, 7?, extends toathird loop or extension arranged on the carbon fila ment D at a short distance from the second. From a fourth loop or extension arranged on the carbon filament D ata short distance from the ment 0 c 0 third a wire, k extends to the metal strip f of the regulator, and from the metal strip f of the regulator a wire, is, extends to a fifth loop or extension arranged on the carbon filament D at a short distance from the fourth. From the metal strip f of the regulator a wire, Z, extends to one end of the main carbon fila- The wires 70 k, 800., are fitted in the flask A in the same manner as the other conductors, and may be united to the carbon strip D in the same manner as the other conductors are united to the carbon filament c 0 0 By turning the spindle h so that the spring g will impinge upon the metal strip f of the regulator a connection is simply made between the wires i and Z, and the full electric current is conducted to the lamp, the carbon filamentDbeing entirely out of the circuit. If, however, the spindle be turned to cause the spring to impinge upon the metal strip f of the regulator, the portion of the carbon filament D between the wires 7t and I0 will be switched into the circuit. If the spring is caused to impinge upon the metal strip f or f of the regulator, the length of the carbon filament D between the wire 75 and the wire k, or between the wire 70 and the wire 7t. is switched into the circuit. The light produced by the lamp may be varied by thus switching into the circuit greater or less resistance. If the spring is made to impingeupon the metal strip f of the regulator, the whole of the carbon filament D will be switched into the circuit. If the spring is made to impinge upon switched into the circuit the light produced by the lamp will be extinguished. Of course 'it is to be understood that a vacuum is to be established and maintained in the flask or globe A. V

WVhat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in an incandescent lamp, of a flask in which a vacuum is estab lished, a main filament for producing light inclosed in the flask, an extra filament constituting a resistance device, also inclosed in the flask, and means whereby a greater or less length of the said extra filament may be switched into or out of the circuit, substantially as specified.

2. The combination, in an incandescent lamp, of a flask in which a vacuum is established, a main filament for producing light inclosed in the flask, an extra filament constitut- 4.. A flask for an incandescent lamp,having' a solid piece or stem,a,of glass, formed around the metallic conductors, and fused to and extending beyond it, substantially as and for the purpose specified.

\ G. A. HUSSEY.

\Vitn esses T. J. KEANE,

JAMES R. BOWEN. 

